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In a region of France, Downy mildew of g...

In a region of France, Downy mildew of grapes was confined to large varieties of grapes. Which of the following measures could be taken to grow grape vines in that region? a. Use of disease resistant varieties. b. Spray with Bordeaux mixture. C.Use of a chemical fertiliser. d. Spray with an insecticide.

A

a and b

B

b and c

C

c and d

D

a and d

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PQRS is a square region of side 2a in the plane of paper. A uniform magnetic field B, directed perpendicular to the plane of paper and into its plane is confined within this square region. A square loop of side 'a' and made of a conducting wire of resistance R is moved at a constant velocity vec(v) from left to right in the plane of paper as shown. Obviously, the square loop will enter the magnetic field at some time and then leave it after some time. During the motion of loop, whenever magnetic flux through it changes, emf will be induced resulting in induced current. Let the motion of the square loop be along x-axis and let us measure x coordinate of the centre of square loop from the centre of the square magnetic field region (taken as origin). Thus, x coordinate will be positive if the centre of square loop is to the right of the origin O (centre of magnetic field) and negative if centre is to the left. For x = -9a//5 , magnitude of induced current and its direction as seen from above will be:

PQRS is a square region of side 2a in the plane of paper. A uniform magnetic field B, directed perpendicular to the plane of paper and into its plane is confined within this square region. A square loop of side 'a' and made of a conducting wire of resistance R is moved at a constant velocity vec(v) from left to right in the plane of paper as shown. Obviously, the square loop will enter the magnetic field at some time and then leave it after some time. During the motion of loop, whenever magnetic flux through it changes, emf will be induced resulting in induced current. Let the motion of the square loop be along x-axis and let us measure x coordinate of the centre of square loop from the centre of the square magnetic field region (taken as origin). Thus, x coordinate will be positive if the centre of square loop is to the right of the origin O (centre of magnetic field) and negative if centre is to the left. External force required to maintain constant velocity of the loop for x = -(9)/(5) a will be

PQRS is a square region of side 2a in the plane of paper. A uniform magnetic field B, directed perpendicular to the plane of paper and into its plane is confined within this square region. A square loop of side 'a' and made of a conducting wire of resistance R is moved at a constant velocity vec(v) from left to right in the plane of paper as shown. Obviously, the square loop will enter the magnetic field at some time and then leave it after some time. During the motion of loop, whenever magnetic flux through it changes, emf will be induced resulting in induced current. Let the motion of the square loop be along x-axis and let us measure x coordinate of the centre of square loop from the centre of the square magnetic field region (taken as origin). Thus, x coordinate will be positive if the centre of square loop is to the right of the origin O (centre of magnetic field) and negative if centre is to the left. For x = a//4 (i) magnetic flux through the loop, (ii) induced current in the loop and (iii) external force required to maintain constant velocity of the loop, will be

AAKASH INSTITUTE ENGLISH-TEST 2-EXERCISE
  1. Select the incorrect match.

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  2. A wheat variety with high protein contents has been used as a donor fo...

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  3. In a region of France, Downy mildew of grapes was confined to large va...

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  4. In tissue culture plant genetically identical to the parental plant is...

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  5. Select the wrong statement with regard to tissue culture

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  6. The development of several high yielding varieties of wheat and rice i...

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  7. Collection of genetic variability is required in plant breeding progra...

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  8. The genes in eukaryotes are said to be split as

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  9. Minisatellites

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  10. Select the correct match.

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  11. All of the following are applications of Restriction Fragment Length P...

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  12. If a cell lacks RNA polymerase III, then it cannot synthesize

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  13. The directions of RNA and DNA synthesis are respectively

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  14. Select the two correct statements out of the four given below about la...

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  15. If the sequence of the nitrogenous bases on template strand is ATCTGGC...

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  16. Select the correct option to fill up the blanks in the following state...

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  17. Select an option that shows the correct sequence of the events involve...

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  18. Griffith discovered the process of

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  19. Identify the type of gene, on the basis of given characters from a to ...

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  20. Peptidyl transferase plays an important role during protein synthesis....

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